var_cache.h

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#ifndef CYGONCE_VAR_CACHE_H
#define CYGONCE_VAR_CACHE_H
//=============================================================================
//
//      var_cache.h
//
//      HAL cache control API
//
//=============================================================================
//####ECOSGPLCOPYRIGHTBEGIN####
// -------------------------------------------
// This file is part of eCos, the Embedded Configurable Operating System.
// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
//
// eCos is free software; you can redistribute it and/or modify it under
// the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 2 or (at your option) any later version.
//
// eCos is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
// for more details.
//
// You should have received a copy of the GNU General Public License along
// with eCos; if not, write to the Free Software Foundation, Inc.,
// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
//
// As a special exception, if other files instantiate templates or use macros
// or inline functions from this file, or you compile this file and link it
// with other works to produce a work based on this file, this file does not
// by itself cause the resulting work to be covered by the GNU General Public
// License. However the source code for this file must still be made available
// in accordance with section (3) of the GNU General Public License.
//
// This exception does not invalidate any other reasons why a work based on
// this file might be covered by the GNU General Public License.
//
// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
// at http://sources.redhat.com/ecos/ecos-license/
// -------------------------------------------
//####ECOSGPLCOPYRIGHTEND####
//=============================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s):    tmichals
// Contributors: nickg, dmoseley
// Date:         2003-02-13
// Purpose:      Cache control API
// Description:  The macros defined here provide the HAL APIs for handling
//               cache control operations.
// Usage:
//               #include <cyg/hal/var_cache.h>
//               ...
//              
//
//####DESCRIPTIONEND####
//
//=============================================================================

#include <pkgconf/hal.h>
#include <cyg/infra/cyg_type.h>

#include <cyg/hal/mips-regs.h>
#include <cyg/hal/hal_arch.h>
#include <cyg/hal/plf_cache.h>
#include <cyg/hal/var_arch.h>



//-----------------------------------------------------------------------------
// Cache dimensions

// Data cache
#define HAL_DCACHE_SIZE                 (1024 *8)   // Size of data cache in bytes
#define HAL_DCACHE_LINE_SIZE            16      // Size of a data cache line
#define HAL_DCACHE_WAYS                 4       // Associativity of the cache

// Instruction cache
#define HAL_ICACHE_SIZE                 (1024*16)   // Size of cache in bytes
#define HAL_ICACHE_LINE_SIZE            16      // Size of a cache line
#define HAL_ICACHE_WAYS                 4       // Associativity of the cache

#define HAL_DCACHE_SETS (HAL_DCACHE_SIZE/(HAL_DCACHE_LINE_SIZE*HAL_DCACHE_WAYS))
#define HAL_ICACHE_SETS (HAL_ICACHE_SIZE/(HAL_ICACHE_LINE_SIZE*HAL_ICACHE_WAYS))

#define HAL_DCACHE_WRITETHRU_MODE       1
#define HAL_DCACHE_WRITEBACK_MODE       0

					   
//-----------------------------------------------------------------------------
// General cache defines.
#define HAL_CLEAR_TAGLO()  asm volatile (" mtc0 $0, $28;" \
                                             " nop;"      \
                                             " nop;"      \
                                             " nop;")
#define HAL_CLEAR_TAGHI()  asm volatile (" mtc0 $0, $29;" \
                                             " nop;"      \
                                             " nop;"      \
                                             " nop;")

/* Cache instruction opcodes */
#define HAL_CACHE_OP(which, op)             (which | (op << 2))

#define HAL_WHICH_ICACHE                    0x0
#define HAL_WHICH_DCACHE                    0x1

#define HAL_INDEX_INVALIDATE                0x0
#define HAL_INDEX_LOAD_TAG                  0x1
#define HAL_INDEX_STORE_TAG                 0x2
#define HAL_HIT_INVALIDATE                  0x4
#define HAL_ICACHE_FILL                     0x5
#define HAL_DCACHE_HIT_INVALIDATE           0x5
#define HAL_DCACHE_HIT_WRITEBACK            0x6
#define HAL_FETCH_AND_LOCK                  0x7

//-----------------------------------------------------------------------------
// Global control of data cache

// Invalidate the entire cache
#define HAL_DCACHE_INVALIDATE_ALL_DEFINED
#define HAL_DCACHE_INVALIDATE_ALL()                                                     \
    CYG_MACRO_START                                                                     \
    register volatile CYG_BYTE *addr;                                                   \
    HAL_CLEAR_TAGLO();                                                                  \
    HAL_CLEAR_TAGHI();                                                                  \
    for (addr = (CYG_BYTE *)CYGARC_KSEG_CACHED_BASE;                                    \
         addr < (CYG_BYTE *)(CYGARC_KSEG_CACHED_BASE + HAL_DCACHE_SIZE);                \
         addr += HAL_DCACHE_LINE_SIZE )                                                 \
    {                                                                                  \
        asm volatile (" cache %0, 0(%1)"                                                \
                      :                                                                 \
                      : "I" (HAL_CACHE_OP(HAL_WHICH_DCACHE, HAL_INDEX_STORE_TAG)),      \
                        "r"(addr));                                                     \
    }                                                                                   \
    CYG_MACRO_END

// Synchronize the contents of the cache with memory.
__externC void hal_dcache_sync(void);
#define HAL_DCACHE_SYNC_DEFINED
#define HAL_DCACHE_SYNC() hal_dcache_sync()

// Set the data cache refill burst size
//#define HAL_DCACHE_BURST_SIZE(_asize_)

// Set the data cache write mode
//#define HAL_DCACHE_WRITE_MODE( _mode_ )

// Load the contents of the given address range into the data cache
// and then lock the cache so that it stays there.
#define HAL_DCACHE_LOCK_DEFINED
#define HAL_DCACHE_LOCK(_base_, _asize_)                                                \
    CYG_MACRO_START                                                                     \
    register CYG_ADDRESS _baddr_ = (CYG_ADDRESS)(_base_);                               \
    register CYG_ADDRESS _addr_ = (CYG_ADDRESS)(_base_);                                \
    register CYG_WORD _size_ = (_asize_);                                               \